package base;
import jm.audio.AudioObject;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;

/**
 * A basic additive synthesis instrument implementation
 * which includes sine waves as overtones.
 *
 * @author Andrew Brown
 */
public final class OvertoneInst extends jm.audio.Instrument {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    /**
     * The number of channels
     */
    private int channels;
    /**
     * the sample rate passed to the instrument
     */
    private int sampleRate;

    /**
     * A constructor to set an initial
     * sampling rate and number of channels.
     *
     * @param sampleRate
     */
    public OvertoneInst(int sampleRate) {
        this.sampleRate = sampleRate;
        this.channels = 2;
    }
    //----------------------------------------------
    // Methods
    //----------------------------------------------

    /**
     * Initialisation method used to build the objects that
     * this instrument will use
     */
    public void createChain() {
        // fundamental
        Oscillator osc0 = new Oscillator(this, Oscillator.SINE_WAVE,
                this.sampleRate, this.channels);
        Volume vol0 = new Volume(osc0, (float) 1.0);
        // 1st harmonic
        Oscillator osc1 = new Oscillator(this, Oscillator.SINE_WAVE,
                this.sampleRate, this.channels);
        osc1.setFrqRatio((float) 2.0);
        Volume vol1 = new Volume(osc1, (float) 0.5);
        // 2nd harmonic
        Oscillator osc2 = new Oscillator(this, Oscillator.SINE_WAVE,
                this.sampleRate, this.channels);
        osc2.setFrqRatio((float) 3.0);
        Volume vol2 = new Volume(osc2, (float) 0.25);
        // 3nd harmonic
        Oscillator osc3 = new Oscillator(this, Oscillator.SINE_WAVE,
                this.sampleRate, this.channels);
        osc3.setFrqRatio((float) 3.0);
        Volume vol3 = new Volume(osc3, (float) 0.025);
        // add them together
        AudioObject[] overtones = {vol0, vol1, vol2, vol3};
        Add adder = new Add(overtones);
        Envelope env = new Envelope(adder, new double[]{0.0, 0.0, 0.1,
                1.0, 1.0, 0.0});
        StereoPan span = new StereoPan(env);
        SampleOut sout = new SampleOut(span);
    }
}